Tough-O-Meter

We've got your back. With the Tough-O-Meter, you'll know whether to bring extra layers or Swiss army knives as you summit the literary mountain. (10 = Toughest)

(2) Sea Level

The hardest thing about this book is understanding Natalie's condition—which really isn't that hard to do. Everything else is straightforward and simple, making this a book you can breeze right through.